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Note 9 - Investments (Details Textual)	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 HKD ($)	Dec. 31, 2018 USD ($)
Debt Securities, Held-to-maturity, Current	$ 512,821	$ 4,000,000
Investment in Held-to-maturity Debt Securities, Term	1 year
Investment in Held-to-maturity Debt Securities, Interest Rate	5.00%	5.00%
Limit of Bond		$ 20,000,000

X

- Definition

Represents the term of an investment in held-to-maturity debt securities.

+ References

No definition available.

+ Details

Name:	bkyi_InvestmentInHeldToMaturityDebtSecuritiesTerm
Namespace Prefix:	bkyi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the interest rate of an investment in held-to-maturity debt securities.

+ References

No definition available.

+ Details

Name:	bkyi_InvestmentInHeldtomaturityDebtSecuritiesInterestRate
Namespace Prefix:	bkyi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the limit of a bond held for investment.

+ References

No definition available.

+ Details

Name:	bkyi_LimitOfBond
Namespace Prefix:	bkyi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity), classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26626-111562

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant